Power-transmitter for sewing-machines.



2 sums-SHEET' 1.

INYEI TUR l TTORNEY.

vA. B. GOHN. POWER TRANSMITTER ron SEWING MACHINES.

APPLIOATIN FILED JUNE 29, 1906.

APatented Nov.3o,19o9.

A. B. COHN. POWER TRANSMITTER ron SEWING MACHINES. APPLIOATION FILEDJUNE 29, 190115.

941,857. muted Nov.. 30, 1909.

2 SHEETS-SHEET 2.

IYITNESSES Y 'l/vvmvron /Ztxmvaaw .3. dah/M y @M/Al-Z; v sr ALEXANDER B.CHN, 0F PHILADELPHIA, PENNSYLVANIA.

POWER-TRANSMITTER FOR SEINGr-MACHINES.

Application filed .Tune 29, 1906.

Specification of Letters Patent.

Patented Nov. 30, 1909.

serial No. 324,010.

To all whom tt may concern:

Be it known that I, ALEXANDER B. CoHN, a citizen of the United States,residing at Fhiladelphia, in the county of Philadelphia and State ofPennsylvania, have invented a new and useful Power-Transmitter forSewing-Machines, of which the following is a specification.

My invention relates to improvements in the operation of sewingmachines, in which a rigid link transmits the power from the drivingdevice to the machine head shaft, and the objects of my improvement are,first, to provide a means which would facilitate the raising of the headof the machine, second, to permit the transmit-ting link to swing and,third, to prevent the transmitting` arm from freezing.

Tt has also certain other novel constructions, combinations andarrangements of parts, as will be hereafter fully described and claimed.

I attain these objects by the mechanism illustrated in the accompanyingdrawing in which- Figure 1, is a side elevation of a sewing machine andof the transmitting device; Fig. 2, is a section of the upper part ofthe transmitting device; Fig. 3, is a section of the lower part of thetransmitting device; Fig. 4, is a detailed view of the lower bearing forthe transmitting link; Fig. 5, is an other' side view of a'sewing`machine, showing a modified transmitting device; Fig. 6, is a section ofthe upper part of the transmitting device of Fig. 5; Fig. 7 is a sectionof the lower part of the transmitting device shown in Fig. 5; Fig. 8 isa detailed view of the clutch operating the transmitter of Fig. 5.

Similar numerals refer to similar parts throughout the several views.

Tn Fig. 1, 1 is the head of a sewing machine, attached by hinges 2 to atable 3, resting on horses 4. 1 carries a shaft 5.

In Fig. 2 is shown a collar 6, attached to 5 by a bolt 7 6 carries awheel 8, by means of which the machine could be operated by hand. G alsocarries a gear 9, which is driven by a gear 10. 6 also forms a bearing11, for one of the journals 12 of a rocker 13. The other journal of therocker revolves in a bearing 14, which is fastened to the machine headat 15, by the arm 16. At its lower end the rocker carries the gear 10about which end 10 is free to revolve. 10 is provided with a key 17,which fits loosely in a channel 1S, milledL in the transmitting shaft19. This arrangement permits the gear and shaft to slide up and downrelative to each other, while when the shaft revolves the gear mustrevolve with it and transmits this motion to gear 9. The upper part ofthe transmitting shaft 19, is free to revolve within the bearing 20, 20,formed by the rocker 13. The lowerpart of 19 revolves in a bearing 21,shown in section in Fig. 3, and in detail in Fig. 4; On the lowerextremity of 19 is forced a friction disk 22, which can be brought infrictional contact with part 24, of a pulley 25. 25 is driven by a grimemover, not shown, and is mounted on a shaft 26, revolving in bearings`in a pedestal 2S. The bearing 21 is extended through a slot 29, inpedestal 2S, to allow the shaft to g, but to prevent it from movingsidewise. lThe bearing 21, carries the arms 30,

80, which arms carry pins, 31, and which pass through the arms 32,Through the arms 32, passes a pin 33, over which arm 34, rocks as at 85.The arms 32 are pivoted on frame 2S as at 60. The arm 34 is swinginglysupported at 37 by a bracket 38 provided with a hole 39 attached topedestal 2S. An arm 40 is pivotally connected with arm 34 by a pin 41,and with a treadle 44 by a pin 43. Pedestal 2S has one end of a spring45 fastened to it. 45 is slipped over a pin 46, fastened to pedestal 28.The other end of spring 45 is fastened to an extension 47 of arm 34.

/Vhen the operator presses the foot or feet against the treadle 44, 40is forced forward reacting on 34, which in its turn forces 32 in adirection to bring the friction disk 22 in contact with 24. 24 being inmotion transmits this motion to shaft 19. Gear 10 mounted on shaft 19,revolves with it and transmits this motion through gear 9 from which thehead shaft of the machine is driven. To avoid the possibility of thefriction disk 22 being pressed too hard against 24, the pin 4G, isprovided for the purpose of preventing bar 34 from being forced too farby the pressure on the treadle, while the spring acts as a cushion. Vhenthe head of the machine is being raised, it swings on its hinges. Thiscauses the transmitting shaft 19 to move outward. Bearing 21 swingsaround its pins 31 and slides along slot 29 in pedestal 28. The upperpart of 19, slides along the key of gear 10, and permits rocker 18 torock. In the modified views Figs. 5, 6, 7, 8, I attain the same objectsin a somewhat different manner. I do away with the support 16, of theupper rocker, and form it into a box 16, free to swing around the headshaft 5, by means of a bearing 14. The lower bearing 21', swings about apin 31', passing through a pedestal 50. On shaft 26, I mount a disk 24,having a key 54, free to slide in a channel 53 in the shaft 26. F orstarting the machine, the treadle transmits the pressure to a ring 51,mounted on bearing of disk 24, which forces 24 against the friction disk22. I mount the checking and cushioning spring 15, on shaft 26, between2A and driving pulley 25. Utherwise the same principle is embodied inthe several views.

IIaving thus fully described my invention, what I claim as new anddesire to secure by Letters Patent, is-

1. In a power transmitter, comprising driving, driven and transmittingmeans, a driven shaft a collar and a gear mounted thereon, a transmittershaft and a gear mounted thereon, a rocker provided with bearings forthe transmitter shaft and with a support for the gear mounted thereon, adriving shaft and a disk mounted thereon, and a pedestal with bearingsfor the driving shaft.

In a power transmitter, comprising driving, driven and transmittingmeans, a driven shaft, a gear liXedly mounted thereon, a transmittershaft provided with a slot, a gear, provided with a key to be slidinglyguided on the shaft and to prevent it from turning about the shaft,mounted thereon, a pivoted rocker provided with bearings for thetransmitter shaft and with a support for the gear mounted thereon, adisk mounted on the transmitter shaft, a driving shaft and a diskmounted thereon, a pedestal provided with bearings for 'said shaft andwith a support for a pivoted means to bring the circumferential surfaceof the disk on the transmitter shaft in frictional contact with thecircumferential surface of the disk on the driving shaft, and a meanssupported by the pedestal to prevent said frictional contact frombecoming excessive.

3. In a power transmitter, comprising horizontally mounted driven means,horizontal driving means mounted at right angles to the driven means,rotatable transmitting' means mounted vertically between the driving anddriven means, pivoted means and a means to operate the pivoted means tocause rotation in the transmitting means in combination with a means tooperate the pivoted means for preventing rotation in the transmittingmeans.

1. A power transmitter for sewing machines, comprising the combinationof driving and driven means mounted at right angles, with transmittingmeans mounted between the driving and driven means, to receive motionfrom the driving means and to transmit motion to the driven means,pivoted means rockingly supporting the receiving end and rocking meansslidingly supporting the transmitting end, means to cause the drivenmeans to rotate with the transmitting means, and means operated by footpressure to cause the transmission of motion from the driving to thetransmitting means in combination with a means to prevent saidtransmission when said pressure is removed.

In testimony whereof I hereunto aflix my signature in the presence oftwo subscribing witnesses.

ALEXANDER B. COI-IN. Vitnesses N. W. TALBOT, MARY E. HAMER.

